PC Engine 6 button controller

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mourix:
This site says "switch that toggles between two-button controls (A mode) and six-button controls (B mode)".

You might get more response soldering the jumper to B mode :angel:

I see the 100 pf missing on your buy list so am suspicious of that one..

pbj:
Okay, took another look at it. I didn't realize C6 was a different value. I have a 100nF / 0.1uF capacitor there. I'll get some of those 100pF ordered.

Put a toggle switch on A/B mode and soldered components on the top side of the board, too. I'm noticing that the options menu will briefly show a 6 button controller plugged in, regardless of what that toggle switch is set to.

Edit - I removed C6 and tried the PCB with nothing in that slot. Now it toggles back and forth between 2 and 6 button mode correctly in the options menu. Definite progress.

:cheers:

mourix:
Awesome! I was gonna say to remove it as it's just a basic filter on the clock line. What's the status on the inputs?

pbj:
Same behavior. Controller pulses a down and button input when plugged in. If I ground out the Run input, I can get buttons I and II to respond if I ground them to their respective inputs.

mourix:
Alright. I would try to check the resistor arrays with your multimeter to really confirm they are good and the bussed ones have the common on dotted PCB pin.

I usually order these IC's for a few units on places like Mouser. Those ones on your board do look quite rough so I hope we did not get a recycled dud ruining your party.

Do you own an oscilloscope? This really is just a few multiplexers when you turn off the turbo stuff :embarassed:

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